Visual feedback for code readers

ABSTRACT

A system and method for providing visual feedback to facilitate multi-code (e.g., barcode) reading (i.e., scanning) is presented. The visual feedback will project a read status for each code scanned. The visual feedback for a particular code will be projected onto that code. For example, an “X” projected onto a code would indicated that this code was not read and needed to be scanned again. This visual feedback minimizes the number of codes that need to be rescanned in the case of a read error.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims the benefit of U.S. Patent ApplicationNo. 62/098,201 for Visual Feedback for Code Readers filed Dec. 30, 2014,which is hereby incorporated by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to barcode (i.e., code) readers (i.e.,scanners) and, more specifically, to a code reader that, when triggered,reads multiple codes on a target (e.g., shipping label) automatically,and projects visual feedback regarding the read status for each codeonto the target.

BACKGROUND

Some code readers are capable of reading (i.e., scanning) multiple codes(e.g., barcodes) in a single scan. These code readers, known as“multi-code readers,” are used to enhance productivity, but may behindered when a code-read error occurs. Errors may occur in barcode codescanning (e.g., due a damaged barcode), and when multi-code scanning, auser may not easily know which codes have been read and which codes havebeen missed and/or skipped. When one code in a multi-code scan ismissed, the user must resort to scanning each code individually. In thisscenario, productivity is lost and the user may become aggravated.

Therefore, a need exists for a multi-code scanner with visual feedbackto indicate the read status for each code. This visual feedback willhelp a user understand which codes have been read and which codes (ifany) have been missed and/or skipped. This feedback could allow a userto zoom in on the missed/skipped codes and re-scan, thereby eliminatingthe need to re-scan each code individually.

SUMMARY

Accordingly, in one aspect, the present invention embraces a multiplecode reading system with visual feedback. The system includes an imagerfor capturing a digital image of a code set in a field of view. The codeset includes a plurality of codes. The system also includes a projectorfor projecting a feedback image selected from a set of feedback images.The system further includes a memory for storing the digital image, theset of feedback images, and a code-reading program. The code-readingprogram configures a processor that is communicatively coupled to theimager, the projector, and the memory to (i) retrieve the digital imagefrom the memory, (ii) detect the codes within the digital image, (iii)read each detected code, (iv) select a feedback image from the set offeedback images for each code, the selection base on the code's readingresults, and (v) project onto each code the code's particularly selectedfeedback image.

In an exemplary embodiment of the multiple code reading system withvisual feedback, the code set includes multiple codes of the samesymbology.

In another exemplary embodiment of the multiple code reading system withvisual feedback, the code set includes multiple codes of mixedsymbologies.

In another exemplary embodiment of the multiple code reading system withvisual feedback, the set of feedback images includes a box with edgescorresponding to a code.

In another exemplary embodiment of the multiple code reading system withvisual feedback, the set of feedback images includes an “X” to cover acode.

In another exemplary embodiment of the multiple code reading system withvisual feedback, the set of feedback images includes a box with edgescorresponding to a code and an “X” to cover a code, wherein (i) the boxis projected onto codes that were read correctly, (ii) the “X” isprojected onto codes that were read incorrectly, and (iii) nothing isprojected onto codes that were not detected.

In another exemplary embodiment of the multiple code reading system withvisual feedback, the set of feedback images includes a box with edgescorresponding to the field of view.

In another exemplary embodiment of the multiple code reading system withvisual feedback, the projector includes a light emitting diode (LED).

In another exemplary embodiment of the multiple code reading system withvisual feedback, the projector includes a laser.

In another exemplary embodiment of the multiple code reading system withvisual feedback, the code set includes barcodes.

In another aspect, the present invention embraces a method for providingvisual feedback regarding a multi-code scan using an imaging barcodescanner. The method includes the step of capturing a digital image of afield of view with the imaging barcode scanner. The field of viewincludes a set of codes for reading, and the method includes the step ofdetecting the codes within the digital image. The method furtherincludes the steps of reading each code, and determining a code statusfor each code. The code status has a positive status if the code wasread and a negative status if an attempt to read the code failed.Finally, the method includes the step projecting visual feedback intothe field of view. The visual feedback includes positive feedbackmessages projected onto codes having a positive status and negativefeedback messages projected onto codes having a negative status.

In an exemplary embodiment of the method, the set of codes includes atwo-dimensional barcode.

In another exemplary embodiment of the method, the set of codes includesa linear barcode.

In another exemplary embodiment of the method, the positive feedbackmessages include a box with edges corresponding to a code.

In another exemplary embodiment of the method, the negative feedbackmessages include an “X” to cover a code.

In another exemplary embodiment of the method, the visual feedbackincludes a box with edges corresponding to the field of view.

In another exemplary embodiment of the method, the visual feedback onlycomprises the box with edges corresponding to the field of view and thepositive or negative feedback message for detected codes within thedigital image.

In another exemplary embodiment of the method, the positive feedbackmessages or the negative feedback messages are partially containedwithin the box corresponding to the field of view.

In another exemplary embodiment of the method, the imaging barcodescanning includes a light emitting diode (LED) for projecting thefeedback.

In another exemplary embodiment of the method, the imaging barcodescanner includes a laser for projecting the feedback.

The foregoing illustrative summary, as well as other exemplaryobjectives and/or advantages of the invention, and the manner in whichthe same are accomplished, are further explained within the followingdetailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 graphically depicts an exemplary shipping label having anexemplary set of codes for reading.

FIG. 2 graphically depicts an exemplary set of codes overlaid withvisual feedback.

FIG. 3 depicts a block diagram of an exemplary multi-code reading systemaccording to an embodiment of the present invention.

FIG. 4 depicts a flow chart of a method for providing visual feedbackaccording to an embodiment of the present invention.

DETAILED DESCRIPTION

The present invention embraces a system and method for providing visualfeedback to facilitate multi-code (e.g., barcode) reading (i.e.,scanning).

Codes, such as barcodes (e.g., linear barcodes, two dimension barcodes)have found use in a wide variety of applications (e.g., shipping).Increasingly multiple codes are affixed to the same item to conveyinformation pertinent to different users and/or pertinent at differenttimes (e.g., different stages of the shipping process). Often multiplebarcodes are arranged in a cluster (i.e., set) so that scanning eachbarcode becomes easier. The code set may include multiple codes of thesame symbology (e.g., all codes are linear barcodes) or may includemultiple codes of mixed symbologies (e.g., some codes are linearbarcodes and some codes are two-dimensional barcodes).

Imaging barcode scanners (e.g., handheld scanner) may be configured toread multiple codes in a single scan (i.e., a single pull of a triggeron a hand-held scanner). The configuration of these multi-code readersmay include a setup file stored in memory that provides information(e.g., number of codes, each code symbology, etc.) regarding the scan tofacilitate each code being read. The imaging scanner may take an imageof a field of view with an imaging subsystem. The image may be stored inscanner's memory and processed using algorithms running on a processorin order to locate, identify, and read each barcode in the image. Inthis way, the multi-code reader may enhance productivity. Troublearises, however, when one or more of the barcodes in the set is notscanned properly.

Successful code reading requires good print quality of the code and goodimage quality of the code image. Image quality is typically the same forall codes in a set but may be affected by inhomogeneous illumination orshadows on a portion of the code set. Various factors affect a code'sprint quality (e.g., ink supply, ink smear, unwanted marks, etc.). Scanerrors may be difficult to understand and not immediately obvious.

In some cases a multi-code scan may result in one or more barcodes of aset (i.e., cluster) having an unsuccessful scan. Without feedback, afailed multi-code scan may require either rescanning all the codes inthe set or, in a worst case, scanning each code of the set individually.

Imaging barcode scanners may have a visual display to show the field ofview. In some cases, feedback regarding the scan results may also bedisplayed using the graphical user interface (i.e., GUI). The presentinvention, however, embraces a system/method for generating feedbackregarding the results of a multi-code scan in a more intuitive andergonomic way. Specifically, the feedback regarding a multi-code scanmay be projected using a projector integrated with the imaging scanner.The projected feedback is adaptable and is adjusted so that each code ina code set may have a corresponding feedback message projected onto it.This feedback message may provide information regarding each barcodescan that is spatially aligned with the code set and on the item that auser is already looking at. The information in this feedback may allow auser to identify a damaged code (i.e., indicium) and rescan or takeanother corrective action (e.g., manually entering in some data).

An exemplary shipping label having a set of codes (i.e., code set) forreading with an imaging barcode scanner is shown in FIG. 1. The shippinglabel 1 includes several codes of the same symbology (i.e., linearbarcodes) 2,3,4,5 for scanning during the shipping process. An imagingbarcode scanner configured for multi-code scanning may read these codeswith one scan as long as they are contained within the scanner's fieldof view. In this exemplary code set, one barcode suffers from printingerrors. The misprinted barcode 3 may be scanned unsuccessfully.

After a scan has been triggered, a digital image of the shipping labelis captured by the imaging barcode scanner. The codes in the image aredetected and read using a processor integrated with the imaging scanneror communicatively coupled to the imaging scanner via a datacommunications link. After reading the codes, the processor runningalgorithms assigns each code a status based on the results of thereading. A positive status is assigned to a code if the code issuccessfully read, while a negative status is assigned to a code if thecode is read unsuccessfully (i.e., read error). The processor configuresa projection subsystem in the imaging scanner to project visual feedbackinto the scanner's field of view. Exemplary codes 2,3,4,5 on theshipping label 1 overlaid with projected visual feedback 6,7,8,9,10regarding the read status for each code are shown in FIG. 2. The visualfeedback for barcodes that are successfully read will be positivefeedback, while the visual feedback for the unsuccessfully read barcodeswill be negative feedback. As shown in FIG. 2, both positive andnegative feedback images (i.e., messages) are projected onto theshipping label 1 simultaneously. The positive feedback in this exemplaryembodiment is a box to surround the code. Boxes 7,9,10 (i.e., a positivefeedback message) are projected over barcodes without printing errors2,4,5, while an “X” (i.e., a negative feedback message) 8 is projectedonto the barcode with printing errors 3. The positive and negativefeedback may be embodied in a multitude of ways. While the feedbackshould imply the positive or negative message, it is not limited to aparticular shape and/or form (i.e., text or graphic).

The feedback shown in FIG. 2 further includes a projected image of alarge box 6. This large box 6 represents the imaging scanner's field ofview. This feedback may provide spatial context and facilitate anunderstanding of the scan results/feedback. For example, if a code iswithin the large box 6 and has neither positive or negative feedbackoverlaid, then a user could assume that this particular code was skippedor missed.

An exemplary block diagram of a multi-code reading system with visualfeedback is shown in FIG. 3. To scan the multi-code reading system 15may be positioned with a target 11 in its field of view 12 (or viceversa). To read the codes and provide visual feedback, the multi-codereading system 15 utilizes a variety of subcomponents/subsystems.

A projection subsystem projects feedback images onto codes that areprinted on (or affixed to) the target 11. The projection subsystemincludes a projector 17. The projector 17 includes a light source togenerate and radiate light. The light source may be a laser diode (LD)or a light emitting diode (LED). The light source generates lightradiation in a portion of the visible (VIS) spectrum. The projector 17may also include a light modulator to create feedback images. The lightmodulator may be reflective (e.g., digital light processing MEMS device)or transmissive (e.g., liquid crystal spatial light modulator). Aprojection lens (or lens group) 16 is placed in front of the projector17 to focus the light into a projection field of view 13 and focuses theprojected light onto the target. The projection lens 16 may be fixed orvariable (e.g., auto) focus.

An imaging subsystem captures images of items located into the imagingfield of view 14. To accomplish this, the imaging subsystem may use animaging lens 20 to render a real image of the imaging field of view 14onto an image sensor 21. This imaging field of view 14 overlaps (atleast partially) with the projection field of view 13. The image sensor21 may be a charge coupled device (i.e., CCD) or a sensor usingcomplementary metal oxide semiconductor (i.e., CMOS) technology. Theimage sensor 21 includes a plurality of pixels that sample the realimage and convert the real-image intensity into an electronic signal.

A digital signal processor (i.e., DSP) 23 may be included to convert theelectronic signals from the image sensor 21 into a digital image and/orcontrol the projector to create the feedback projections.

A processor 18 is communicatively coupled to the projection subsystemand imaging subsystem (e.g., coupled to the DSP controlling theprojection and imaging subsystems). The processor 18 may be embodied ina variety of ways, such as (but not limited to) one or more controllers,a digital signal processor (DSP), an application specific integratedcircuit (ASIC), a programmable gate array (PGA), and/or a programmablelogic controller (PLC).

The processor 18 is typically configured by software (e.g., acode-reading program) stored in memory 24 (e.g., read only memory (ROM),flash memory, random access memory (RAM), and/or a hard-drive). Thesoftware, when executed by the processor 18 configures the multi-codereading system to (i) retrieve a digital image from the memory 24, (ii)detect codes within the digital image, (iii) read each detected code,(iv) select (for each code) a feedback image from a set of feedbackimages (stored in memory) based each code's reading results, and (v)project the selected feedback images onto the appropriate codes.

The multi-code reading system 15 may also include a user interface 25 totransmit information to a user and receive input from a user (e.g.,trigger a scan). The user interface 25 may include interface elements(e.g., touch buttons, touch screen, trigger switch, etc.).

The multi-code reading system 15 may also include a communicationsubsystem 19 for transmitting and receiving information to/from aseparate computing device and/or storage device. This communicationsubsystem may be wired or wireless and may enable communication with avariety of protocols (e.g., IEEE 802.11, including WI-FI®, BLUETOOTH®,CDMA, TDMA, or GSM).

The subsystem/components in the multi-code reading system 15 areelectrically connected via couplers (e.g., wires or fibers), buses, andcontrol lines to form an interconnection system 26. The interconnectionsystem 26 may include power buses or lines, data buses, instructionbuses, address buses, etc., which allow operation of thesubsystems/components and interaction there between.

A flow chart of a method for providing visual feedback regarding amulti-code scan using an imaging barcode scanner is shown in FIG. 4.

The method begins with capturing a digital image of a set of codes(e.g., linear barcodes, two-dimensional barcodes, etc.) in a field ofview with an imaging barcode scanner 30. The imaging barcode scanner maybe a single purposed device (e.g., handheld scanner), a mode ofoperation in a multipurpose device (e.g., mobile computing device), or apart of a larger system (e.g., point of sale system).

The digital image is processed to detect codes within the image 31.Next, a code is read 32 using code reading algorithms commonly used inthe art. If an error is detected, (e.g., using error correction dataencoded into the code) then the code is assigned a negative status 35.If the code is read successfully, however, it is assigned a positivestatus 34. The steps of reading a code and assigning the code a statusare repeated for each code until there are no unread codes and all codeshave been assigned a status 36.

The method concludes by projecting positive feedback messages (e.g., abox surrounding a barcode) onto codes having a positive status 37, andprojecting negative feedback messages onto codes having a negativestatus 38.

Thus, the present invention embraces a system/method to provide visualfeedback (e.g., indicia reading status information) to a user. Thefeedback may be created using the indicia reader's highlight beamprojector to highlight indicia and convey information. This informationis displayed on the target (i.e., object) instead of on a display andis, therefore, intuitive and convenient.

* * *

To supplement the present disclosure, this application incorporatesentirely by reference the following commonly assigned patents, patentapplication publications, and patent applications:

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In the specification and/or figures, typical embodiments of theinvention have been disclosed. The present invention is not limited tosuch exemplary embodiments. The use of the term “and/or” includes anyand all combinations of one or more of the associated listed items. Thefigures are schematic representations and so are not necessarily drawnto scale. Unless otherwise noted, specific terms have been used in ageneric and descriptive sense and not for purposes of limitation.

The invention claimed is:
 1. A multi-code reading system with visualfeedback, the system comprising: an imager for capturing a digital imageof a code set in a field of view, the code set comprising a plurality ofphysical codes; a projector for projecting onto at least one physicalcode of the plurality of physical codes a visual feedback indicatorselected from a set of visual feedback indicators; a memory for storingthe digital image, the set of visual feedback indicators, and acode-reading program; and a processor communicatively coupled to theimager, the projector, and the memory, wherein the processor isconfigured by the code-reading program to: (i) retrieve the digitalimage from the memory, (ii) detect the codes within the digital image,(iii) read each detected code, (iv) for the at least one physical code,select a visual feedback indicator from the set of visual feedbackindicators, the selection being based on the code's reading results, (v)project onto the at least one physical code the code's selected visualfeedback indicator; and (vi) project a box with edges corresponding tothe field of view.
 2. The multi-code reading system according to claim1, wherein the code set comprises multiple codes of the same symbology.3. The multi-code reading system according to claim 1, wherein the codeset comprises multiple codes of mixed symbologies.
 4. The multi-codereading system according to claim 1, wherein the set of visual feedbackindicators comprises a box with edges corresponding to a code.
 5. Themulti-code reading system according to claim 1, wherein the set ofvisual feedback indicators comprises an “X” to cover a code.
 6. Themulti-code reading system according to claim 1, wherein the set ofvisual feedback indicators comprises a box with edges corresponding to acode and an “X” to cover a code, wherein (i) the box is projected ontocodes that were read correctly, (ii) the “X” is projected onto codesthat were read incorrectly, and (iii) nothing is projected onto codesthat were not detected.
 7. The multi-code reading system according toclaim 1, wherein the projector comprises a light emitting diode (LED).8. The multi-code reading system according to claim 1, wherein theprojector comprises a laser.
 9. The multi-code reading system accordingto claim 1, wherein the code set comprises barcodes.
 10. A method forproviding visual feedback regarding a multi-code scan using an imagingbarcode scanner, the method comprising: capturing a digital image of afield of view with the imaging barcode scanner, the field of viewcomprising a set of codes for reading; detecting the codes within thedigital image; reading each code; determining a code status for eachcode, the code status having (i) a positive status if the code was readand (ii) a negative status if an attempt to read the code failed; andprojecting visual feedback into the field of view, the visual feedbackprojected onto the set of codes that are printed on or affixed to atarget, wherein the visual feedback comprises: (i) positive feedbackmessages projected onto codes having a positive status; (ii) negativefeedback messages projected onto codes having a negative status; and(iii) a box with edges corresponding to the field of view.
 11. Themethod according to claim 10, wherein the set of codes comprises atwo-dimensional barcode.
 12. The method according to claim 10, whereinthe set of codes comprises a linear barcode.
 13. The method according toclaim 10, wherein the positive feedback messages each comprise a boxwith edges corresponding to a code.
 14. The method according to claim10, wherein the negative feedback messages each comprise an “X” to covera code.
 15. The method according to claim 10, wherein the visualfeedback only comprises the box with edges corresponding to the field ofview and the positive or negative feedback messages for detected codeswithin the digital image.
 16. The method according to claim 15, whereinthe positive feedback messages or the negative feedback messages arepartially contained within the box corresponding to the field of view.17. The method according to claim 10, wherein the imaging barcodescanner comprises a light emitting diode (LED) for projecting thefeedback.
 18. The method according to claim 10, wherein the imagingbarcode scanner comprises a laser for projecting the feedback.